sargent



(No Model.)

H. B. SARGENT. BOLT CASE.

No. 602,271. Patented Apr. 12,1898.

'Nrrnn STATES; P TENT union.

HENRY B. SARGENT, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO THE SARGENT 8: COMPANY, OF SAME PLACE.

BOLT-GAS E.

SPECIFICATION forming part of Letters Patent No. 602,271, dated April 12, 1898. Application filed January 18, 1896. Serial No. 575 ,954. (No model.)

To all whom it may concern.-

Be it known that I, HENRY B. SARGENT, of

, New Haven, in the county of New Haven and full, clear, and exact description of the same,

and which said drawings constitute part of this specification, and represent, in'- I Figure 1, a plan view of such a blank as may be used in producing my improved boltcases, the blank having the transversely-arranged handle-stem clearance-slots of the bolt-housing formed in it; Fig. 2, a plan view of the blank after it has been struck up and showing how its edges and ends are drawn out of shape by that operation; Fig. 3, a plan view of the completed article, which is produced by trimming a struck-up blank on the broken lines of Fig. 2; Fig. 4, a view of the completed article in side elevation; Fig. 5, a view thereof in cross-section on the line'a b of Fig. 3; Fig. 6, a similar view on the line 0 (Z' of the same figure.

My invention relates to an improvement in sheet-metal bolt-cases, the object being to produce a drawn sheet-metal bolt-case without cracking or tearing the metal, whereby a great economy of labor and material is secured and whereby a better and more attractive article is produced.

With these ends in view my invention consists in a sheet-metal bolt-case having certain details of construction and combinations of parts, as will be hereinafter described, and pointed out in the claim.

In carrying out my invention I employ a sheet-metal blank A in the form of a parallelogram and having two transverselyarranged handle-stem clearance-slots Af and A This blank is put into a press furnished with suitable drawing and cutting instrumentalities, whereby the central portion of the blank is drawn to form a bolt-housing 13. During this operation the blank is transversely out on the lines 13 B to separate the ends of the housing B from the ends of the blank. As the metal is stretched and drawn to form the bolt-housing the sides or edges of the blank are drawn inward, and this strain extends also into the ends of the blank, by which I mean those portions thereof lying outside of the transverse cuts B B. The said ends of the blank resist the stretching and drawing of the metal, as required to produce the bolt-housing B, and opposing lines of strain are set up, which culminate, so to speak, in the four corners of the bolt-housing or very near the same. i To reduce these strains and prevent the metal from tearing or cracking, I construct the drawing and stretching instrumentalities of the press to produce four slackproviding flutes O, which are respectively located in the ends of the plate portion of the blank at points which may be said to inter sectthe four corners of the bolt-housing. These flutes perform their slack-providing function during the production of the boltcase, as described- In the completed boltcase they stiffen the same and also assist the housing in guiding the bolt. They also give a finished appearance to the completed article. I. may further add that these flutes are arranged longitudinally and so as to extend outward from the ends of the bolt-housing. My

reason for calling them slack-providing has already been made apparent. After the blank comes from the press it is trimmed on the broken lines of Fig. 2, so as to give the article the form shown in Figs. 2, 3, and 4. Before the article is finished the slots A A are united by a longitudinal clearance-slot A and the flat portions of the plate are formed with screw-holes D, by means of which it is secured in place. I wish to point out in particular that in producing the bolt-housing the metal of the blank is actually stretched, so that in the completed article the metal is thinner in the bolt-housing than in the flat or plane portions of the articles. In other Words, the bolt-housingisdrawn from the blank, the central longitudinal portion of which is stretched invthe drawing operation. I here call attention to my useof the word drawn in its technical sense of stretching and emphasize this point, because my improved bolt-case is not to be confounded with sheet-metal bolt-cases which are formed or sheet metal, comprising longitudinally --arranged slack-providing flutes formed in they fiat ends of the plate portion of the case, and located at the corners of the bolt-housin g which is drawn from the central portion of the blank from which the plate is formed, the drawing of the said portion of the plate tending to form cracks in the metal at the point where the ends of the housing merge into the plate portion of the case, and the presence of the said slack-providing flutes relieving the strain upon the metal at such points and preventing the metal from cracking.

In testimony whereof I have signed this specification in the presence of two subscribl'ng witnesses.

HENRY B. SARGENT.

Witnesses:

ELLIOTT LITTLEJOHN, ANNIE H. HORAN. 

